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Amazon Linux AMI : postgresql94 / postgresql95 (ALAS-2017-885)

critical Nessus Plugin ID 102873

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Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

pg_user_mappings view discloses passwords to users lacking server privileges :

An authorization flaw was found in the way PostgreSQL handled access to the pg_user_mappings view on foreign servers. A remote authenticated attacker could potentially use this flaw to retrieve passwords from the user mappings defined by the foreign server owners without actually having the privileges to do so. (CVE-2017-7547)

Empty password accepted in some authentication methods :

It was found that authenticating to a PostgreSQL database account with an empty password was possible despite libpq's refusal to send an empty password. A remote attacker could potentially use this flaw to gain access to database accounts with empty passwords. (CVE-2017-7546)

lo_put() function ignores ACLs :

An authorization flaw was found in the way PostgreSQL handled large objects. A remote authenticated attacker with no privileges on a large object could potentially use this flaw to overwrite the entire content of the object, thus resulting in denial of service. (CVE-2017-7548)

Solution

Run 'yum update postgresql94' to update your system.

Run 'yum update postgresql95' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2017-885.html

Plugin Details

Severity: Critical

ID: 102873

File Name: ala_ALAS-2017-885.nasl

Version: 3.5

Type: local

Agent: unix

Published: 9/1/2017

Updated: 4/18/2018

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:postgresql95-docs, p-cpe:/a:amazon:linux:postgresql94-docs, p-cpe:/a:amazon:linux:postgresql95-plperl, p-cpe:/a:amazon:linux:postgresql94-libs, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:postgresql94, p-cpe:/a:amazon:linux:postgresql95-plpython27, p-cpe:/a:amazon:linux:postgresql95-test, p-cpe:/a:amazon:linux:postgresql94-contrib, p-cpe:/a:amazon:linux:postgresql94-debuginfo, p-cpe:/a:amazon:linux:postgresql94-plperl, p-cpe:/a:amazon:linux:postgresql94-plpython27, p-cpe:/a:amazon:linux:postgresql94-test, p-cpe:/a:amazon:linux:postgresql95-static, p-cpe:/a:amazon:linux:postgresql95, p-cpe:/a:amazon:linux:postgresql95-server, p-cpe:/a:amazon:linux:postgresql95-debuginfo, p-cpe:/a:amazon:linux:postgresql95-plpython26, p-cpe:/a:amazon:linux:postgresql94-plpython26, p-cpe:/a:amazon:linux:postgresql95-devel, p-cpe:/a:amazon:linux:postgresql95-contrib, p-cpe:/a:amazon:linux:postgresql94-server, p-cpe:/a:amazon:linux:postgresql94-devel, p-cpe:/a:amazon:linux:postgresql95-libs

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Patch Publication Date: 8/31/2017

Reference Information

CVE: CVE-2017-7546, CVE-2017-7547, CVE-2017-7548

ALAS: 2017-885